I use H110 for my Marlin 1894SS .44 mag. After reading an article by Brian Pearce in a recent Handloader magazine about Alliants Power Pro 300MP powder, I've been giving it a real hard look. Mr. Pearce spoke very highly of this powder. The other great thing (at least IMHO it's great) is it don't require the use of a magnum primer, and it was producing some astounding velocities. Once I use up my last bit of H110 I plan on giving it a try.